BSc (Hones) in Information Technology
Specialized in Interactive Media
Batch 2016
Multimedia Systems
Tute 5
R.A.P.C.P RANASINGHE
IT14115394
1.
List the steps involved in capturing video, compressing the video, and
preparing it for DVD. Briefly discuss the decisions you need to make with each
step regarding compromises on image quality and other limiting factors.
First of all to capture video, need a Camera.
There are few things to consider before capturing a video.
·
Quality
·
Playback Time
·
Video Resolution
You need to consider about the
recording time and playback time according to the audience. And the quality
depends on the purpose of your video. Mobile device it’s not required more
quality, but it also depend on audience. If video resolution is poor no one
will watch these days. However both this Quality & Video Resolution depends
on the media that is going to share. If it is share through web, video must be
medium quality and the file size should be low. This is compulsory.
We can’t prepare DVD with the
rough video footage. It should be edited and compress to run in all devices. To
do that now required software. When you have edited it in software like Premier
Pro you must export and use settings that will give you a good resolution and a
small file size.
2.
Discuss how the computer monitor image differs from a television image.
List the limitations in creating images on the computer destined for a
television screen.
Both Television and Monitor
looks like same, physically both work as same. But these two works differently
in inside. Generally Television are used to watch Over the Air Broadcast. But
Monitors not. Monitors designed specially to works with Computer. But someone
will tell “there’s no different between television and Monitor”
When we watch a video in a TV
& Monitor within same size as resolution. Oft-time TV will get the place,
but it’s not. TVs are designed to get the attraction with another model. Manufactures
cheating in human illusion. They done different things to get vivid colors in a
TV. But in a Monitor this isn’t done that much. That’s why Monitor have more
settings than TV. We can collaborate our monitor. Most HDTVs are 16:9 ratio but
most Wide Monitors are 16:10. These is because monitor is used to work near,
but TVs are watched from far away at least 5m. Most important thing is computer
graphic card will not always compatible with the TV, but Monitor can as I
mentioned before Monitors designed to computers. When TV is used to work as
monitor we can see each and every pixel but monitor we can’t see in our naked
eye.
Limitations
·
Color Palates
·
Pixel size are defer (1x Monitor / 1.06x TV)
·
Resolution
3.
Discuss several considerations in shooting and editing video for
multimedia. What techniques would you use to produce the best possible video,
at a reasonable cost? Which of these techniques apply to all video, and which
apply specifically to multimedia?
Before start shooting a video, need to come up
with a storyboard and script. You should come up with a camera that is
technically changeable settings. To editing purpose you need a computer with
higher performance to run the application smoothly.
To
produce a best video these techniques should follow.
·
Concept/purpose of video
·
Script
·
Lighting
·
sound
·
Composition
·
postproduction
·
Basic Video rules (180o plane)
·
Storyboard
4.
Define codec and list an example of a codec.
Codec stands for Compressor and Decompress. Codecs can be
implemented in software, hardware or combination of both. Codec is a technology
for compressing and decompressing data. Codecs main benefit is reduce file size
and decompress when it need.
MUSIC CODECS MOVIE/VIDEO
CODECS
MP3 MPEG-1 H.264
AAC MPEG-2 H.265 (HEVC)
MPEG-4
5.
What is “Chroma Keys”? Explain the importance and the different
techniques.
Chroma Key or Green Screen is a
techniques for layering two video/Image together and create a production. This
has been used in remove a background from the video and add separate background
to the video. Most of the Hollywood Movies use this techniques to add special
effects and compose their production.
Green Screen & Blue Screen
Both of this is used to create
special effects and remove background or elements of the video. The most
important factor for a key is the color separation of the background and
foreground.
When using Blue screen their few
drawbacks.
1) Jeans are blue and the screen
also blue, it’s hard to separate both these same color areas.
2) The camera not more sensitive to
blue color and as a result of this cannot separate background and foreground
easily.
Benefits of using Green Screen
1) Image sensors are more sensitive
to green, there for green channel contains least noise
2) Less light is needed to
illuminate green.
Major Factors
1) Lighting
2) Programing
3) clothing
4) Exposure
5) background
